Which is an example of a portal of exit for an infection?

A portal of exit is a route by which an infectious agent leaves an infected person. A sneeze can expel infectious droplets from the respiratory tract, so “a sneeze” is the example. Effectively washed hands and hair on the floor are not routes by which an infection leaves the body, and the bloodstream is generally a place an infectious agent may be found rather than an exit route in this context.

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